Production of fast shades on vegetable fibers and dyestuffs therefor.



b'oth residents HERBERT LEVINSTEIN AND JAMES BADDILEY, OF

BLACKLEY, MANCHESTER, ENG- LAND, ASSIGNORS TO LEVINSTEIN'LIMITED, OF MANCHESTER, ENGLAND.

PRODUCTION OF FAST SHADES ON VEGETABLE FIBERS AND DYESTUFFS THEREFOR.

1 232 056 Specification of Letters Patent. No Drawing.

To all whom it may concern:

Be it known that we, HERBERT LEVIN- STEIN and JAMES 'BADD1LEY,'both subjects of the King of Great Britain and Ireland, and of Blackley, Manchester, in

the county of Lancaster, England, have invented new and useful Improvements in the Production of Fast Shades on Vegetable Fibers and Dyestuffs Therefor, of which the following is a specification.

It has been shown in the specification of our prior British Letters Patent N 0. 27525 of 1912 that by coupling two molecules of resorcin with a tetrazo body of the following general formula w-NH.CO.C6H4.N=N-

where D is a residue of the general constitution.

Ar.CO.NI-I.Ar

where Ar represents an aryl radical, brightsubstantive orange, red, or brown dyestuffs after dyeing, are fixed with formaldehyde on vegetable fiber. Shades faster to boiling soap than those produced bydeveloped dyestuffs are thus obtained more conveniently than by methods involving the use of either developed or vat dyestufi's.

lVe have found on further investigation that similarly fast other shades may be obtained on-vegetable fibers by other dyestuffs of analogous composition by similarly aftertreating the dyed shades with formaldehyde. The new dyestufls are obtained by coupling Patented July 3, 1911 'Y.

Application filed December 1, 1913. Serial No. 804,117.

R indicating a ring formation and including 1.2-aminoaryl triazol-, oXazol-, thiazol-, imidazol-, azimido-, residues ofthecompounds indicated in the formula,

1 being a residue of the following constitution Ar indicating an aromatic radical. 7

Example: 256 parts of meta-meta-diamino-azoxytoluene are converted into the tetrazo compound by means of 138 parts of sodium nitrite, and the necessary amount of hydrochloric acid, and the tetrazo compound combined in soda-alkaline solution With: -;356 parts of metataminophenyl-lz2- napli thimidazol: 5 oxy: 7 sulfonic acid. The intermediate compound thus obtained is rediazotized by means of 68 parts of sodium nitrite and the necessary quantity of hydrochloric acid and the resulting tetrazo compound combined with 220 parts of resorcin in the presence of an excess of sodium carbonate. When the combination'is completed thedyestufi' is isolated in the usual manner. It dyescotton directly and when the dyeings are aftertreated with 3% formaldehyde (40%) at in w hich R stands'for a ring formation contaming nitrogen in the ring and D represents the nucleus of a diamin containing at tetrazo compounds having a least two aryl nuclei one of which is joined to each azo groupattached to said nucleus.

2. Dyestuffs capable of being fixed on vegetable fibers by aftertreatment with formaldehyde, formed by coupling two'molecules of resorcin with tetrazo compounds having a nucleus of the general constitution:

in which R stands for a ring formation containing nitrogen in the ring and D represents the nucleus of a-diamin containing at least two ary-l nuclei one of which is joined to each azo group attached to said v nucleus.

In witness'whereof we have hereunto set our hands in the presence of two subscribing Witnesses.

. HERBERT LEVINSTEIN.

JAMES BADDILEY.

Witnesses:

I ERNOLD SIMPSON MosELEY,

MALCOLM SMETHURST. 

